a301e1a895
Split GEPs that have more than one non-zero offset into two GEPs. This is in preparation for the ptradd migration, which can only represent such GEPs. This also enables CSE and LICM of the common base.
120 lines
3.5 KiB
LLVM
120 lines
3.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; Verify that strlen calls with elements of constant arrays are folded.
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;
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; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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declare i32 @strcmp(ptr, ptr)
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@a5 = constant [5 x [4 x i8]] [[4 x i8] c"123\00", [4 x i8] c"123\00", [4 x i8] c"12\00\00", [4 x i8] zeroinitializer, [4 x i8] zeroinitializer]
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; Fold strcmp(a5[0], a5[1]) to '1' - '1'.
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define i32 @fold_strcmp_a5i0_a5i1_to_0() {
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; CHECK-LABEL: @fold_strcmp_a5i0_a5i1_to_0(
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; CHECK-NEXT: ret i32 0
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;
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%q = getelementptr [5 x [4 x i8]], ptr @a5, i64 0, i64 1, i64 0
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%cmp = call i32 @strcmp(ptr @a5, ptr %q)
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ret i32 %cmp
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}
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; Do not fold strcmp(a5[0], a5[I]) where the index I is not constant.
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define i32 @call_strcmp_a5i0_a5iI(i64 %I) {
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; CHECK-LABEL: @call_strcmp_a5i0_a5iI(
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; CHECK-NEXT: [[Q:%.*]] = getelementptr [4 x i8], ptr @a5, i64 [[I:%.*]]
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; CHECK-NEXT: [[CMP:%.*]] = call i32 @strcmp(ptr noundef nonnull dereferenceable(4) @a5, ptr noundef nonnull dereferenceable(1) [[Q]])
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; CHECK-NEXT: ret i32 [[CMP]]
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;
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%q = getelementptr [5 x [4 x i8]], ptr @a5, i64 0, i64 %I, i64 0
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%cmp = call i32 @strcmp(ptr @a5, ptr %q)
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ret i32 %cmp
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}
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; Same as above but for strcmp(a5[I], a5[0]).
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define i32 @call_strcmp_a5iI_a5i0(i64 %I) {
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; CHECK-LABEL: @call_strcmp_a5iI_a5i0(
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; CHECK-NEXT: [[P:%.*]] = getelementptr [4 x i8], ptr @a5, i64 [[I:%.*]]
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; CHECK-NEXT: [[CMP:%.*]] = call i32 @strcmp(ptr noundef nonnull dereferenceable(1) [[P]], ptr noundef nonnull dereferenceable(4) @a5)
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; CHECK-NEXT: ret i32 [[CMP]]
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;
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%p = getelementptr [5 x [4 x i8]], ptr @a5, i64 0, i64 %I, i64 0
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%cmp = call i32 @strcmp(ptr %p, ptr @a5)
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ret i32 %cmp
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}
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; Fold strcmp(a5[0], &a5[1][1]) to '1' - '2'.
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define i32 @fold_strcmp_a5i0_a5i1_p1_to_0() {
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; CHECK-LABEL: @fold_strcmp_a5i0_a5i1_p1_to_0(
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; CHECK-NEXT: ret i32 -1
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;
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%q = getelementptr [5 x [4 x i8]], ptr @a5, i64 0, i64 1, i64 1
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%cmp = call i32 @strcmp(ptr @a5, ptr %q)
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ret i32 %cmp
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}
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; Do not fold strcmp(a5[0], &a5[1][I]) when the index I is not constant.
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define i32 @call_strcmp_a5i0_a5i1_pI(i64 %I) {
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; CHECK-LABEL: @call_strcmp_a5i0_a5i1_pI(
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; CHECK-NEXT: [[Q:%.*]] = getelementptr i8, ptr getelementptr inbounds nuw (i8, ptr @a5, i64 4), i64 [[I:%.*]]
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; CHECK-NEXT: [[CMP:%.*]] = call i32 @strcmp(ptr noundef nonnull dereferenceable(4) @a5, ptr noundef nonnull dereferenceable(1) [[Q]])
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; CHECK-NEXT: ret i32 [[CMP]]
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;
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%q = getelementptr [5 x [4 x i8]], ptr @a5, i64 0, i64 1, i64 %I
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%cmp = call i32 @strcmp(ptr @a5, ptr %q)
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ret i32 %cmp
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}
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; Fold strcmp(&a5[0][1], a5[1]) to '2' - '1'.
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define i32 @fold_strcmp_a5i0_p1_a5i1_to_0() {
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; CHECK-LABEL: @fold_strcmp_a5i0_p1_a5i1_to_0(
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; CHECK-NEXT: ret i32 1
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;
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%p = getelementptr [5 x [4 x i8]], ptr @a5, i64 0, i64 0, i64 1
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%q = getelementptr [5 x [4 x i8]], ptr @a5, i64 0, i64 1, i64 0
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%cmp = call i32 @strcmp(ptr %p, ptr %q)
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ret i32 %cmp
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}
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; Fold strcmp(a5[0], a5[2]) to a5[0][2] - a5[2][2] or 1.
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define i32 @fold_strcmp_a5i0_a5i2_to_0() {
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; CHECK-LABEL: @fold_strcmp_a5i0_a5i2_to_0(
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; CHECK-NEXT: ret i32 1
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;
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%q = getelementptr [5 x [4 x i8]], ptr @a5, i64 0, i64 2, i64 0
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%cmp = call i32 @strcmp(ptr @a5, ptr %q)
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ret i32 %cmp
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}
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; Fold strcmp(a5[2], a5[0]) to a5[0][2] - a5[2][2] or 1.
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define i32 @fold_strcmp_a5i2_a5i0_to_m1() {
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; CHECK-LABEL: @fold_strcmp_a5i2_a5i0_to_m1(
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; CHECK-NEXT: ret i32 -1
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;
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%q = getelementptr [5 x [4 x i8]], ptr @a5, i64 0, i64 2, i64 0
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%cmp = call i32 @strcmp(ptr %q, ptr @a5)
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ret i32 %cmp
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}
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